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珊瑚礁砂混凝土外加剂优选复配技术研究
作者：陈飞翔1，3，4，高玉军2，3，4，张国志1，3，4，秦明强2，3，4
（1.中交第二航务工程局有限公司，湖北 武汉 430040；2.中交武汉港湾工程设计研究院有限公司，湖北 武汉 430040；
3.长大桥梁建设施工技术交通行业重点实验室，湖北 武汉 430040；
4.中交公路长大桥建设国家工程研究中心有限公司，湖北 武汉 430040）
摘要：珊瑚礁砂具有疏松多孔、质脆易碎的物理和化学特性，使得其在制备混凝土时使用的外加剂应具有适当的消泡性、保气性和良好的增黏、保坍、抗吸附性能，试验优选复配了适用于珊瑚礁砂混凝土的专用外加剂。结果表明：专用外加剂的复配比例（折固）为：m（聚羧酸减水剂S410）∶m（ZC-2）∶m（K1）∶m（T1）∶m（B315）=15∶0.09∶6∶0.1∶4.8；珊瑚礁砂混凝土的内部温度在浇筑后的52 h达到最高点，温峰值为67.7 ℃；28 d龄期的珊瑚礁砂混凝土中生成了大量的C-S-H和AFt，C-S-H与AFt相互交织形成了密实的结构，同时在界面过渡区很难观察到结晶完好的六方板状Ca（OH）2晶体。
关键词：珊瑚礁砂；混凝土；外加剂；优选复配
中图分类号：TU528.042 文献标识码：A 文章编号：1001-702X（2020）01-0117-06
Study on the compounding technology of coral reef sand concrete admixture
CHEN Feixiang1，3，4，GAO Yujun2，3，4，ZHANG Guozhi1，3，4，QIN Mingqiang2，3，4
（1.CCCC Second Harbor Engineering Co. Ltd.，Wuhan 430040，China；2.CCCC Wuhan Harbor Engineering Design and Research
Co. Ltd.，Wuhan 430040，China；3.Key Laboratory of Large-span Bridge Construction Technology，Wuhan 430040，China；
4.CCCC Highway Bridge National Engineering Research Centre Co. Ltd.，Wuhan 430040，China）
Abstract：Coral reef sand is loose，porous，brittle and fragile. The admixture used in the preparation of concrete should have appropriate defoaming and gas retention properties，good viscosity-increasing，moisture-preserving and anti-adsorption properties. A special admixture suitable for coral reef sand concrete can be compounded to produce concrete with good performance. The test results show that the compounding mass ratio of the special admixture is m（410）∶m（ZC-2）∶m（K1）∶m（T1）∶m（B315）=15∶0.09∶6∶0.1∶4.8. The internal temperature of the coral reef sand concrete reached the highest point at 52 h after pouring，and the temperature peak was 67.7 ℃. A large amount of C-S-H and AFt were formed in the 28-day-old coral reef sand concrete. C-S-H and AFt interweave to form a dense structure，and it is difficult to observe the crystallized hexagonal plate-like Ca（OH）2 crystal in the interfacial transition zone.
Key words：coral reef sand，concrete，admixture，preferred compounding